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Q. No.Which statement is not correct regarding the adsorption of a gas on the surface of a solid:
1.
On increasing temperature adsorption increase continuously
2.
Enthalpy & entropy change is negative
3.
Adsorption is more for some specific substance
4.
Reversible
Subtopic: Adsorption and Absorption |
75%
From NCERT
AIPMT - 2001
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According to the adsorption theory of catalysis, the speed of the reaction increase because:
| 1. | The concentration of reactant molecules at the active centers of the catalyst becomes high due to adsorption |
| 2. | In the process of adsorption, the activation energy of the molecules becomes large |
| 3. | Adsorption produces heat which increases the speed of the reaction |
| 4. | Adsorption lowers the activation energy of the reaction |
Subtopic: Adsorption and Absorption |
From NCERT
AIPMT - 2003
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Incorrect statement regarding adsorption is:
| 1. | Adsorption is a surface phenomenon of accumulation of molecules of a substance at the surface rather than in the bulk of a solid or liquid. |
| 2. | Adsorption involves penetration through the surface to the bulk of the solid or liquid. |
| 3. | The substance that gets adsorbed is called the ‘adsorbate’ and the substance on whose surface the adsorption takes place is called the ‘adsorbent’. |
| 4. | During absorption, the substance gets uniformly distributed throughout the bulk of the solid or liquid. |
Subtopic: Adsorption and Absorption |
80%
From NCERT
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Why is a finely divided substance more effective as an adsorbent?
1. Small surface area.
2. Large surface area.
3. Weak molecular bonding.
4. Strong molecular bonding.
Subtopic: Adsorption and Absorption |
85%
From NCERT
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The factors that influence the adsorption of a gas on a solid is/are:
1. Nature of the gas.
2. Surface area of the solid.
3. Effect of pressure.
4. All of the above.
Subtopic: Adsorption and Absorption |
95%
From NCERT
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An adsorption isotherm is a plot between:
| 1. | The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant V. |
| 2. | The extent of adsorption \(({x \over m})\) against the pressure of gas (P) at constant T. |
| 3. | The extent of absorption \(({x \over m})\) against the volume of gas (V) at constant P. |
| 4. | The extent of absorption \(({x \over m})\) against the pressure of gas (P) at constant T. |
Subtopic: Adsorption Isotherm |
81%
From NCERT
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Adsorbent can be activated by:
| 1. | Increasing the surface area of the adsorbent. |
| 2. | Breaking adsorbent into smaller pieces or powdering it. |
| 3. | Both (1) and (2) |
| 4. | None of the above. |
Subtopic: Adsorption and Absorption |
89%
From NCERT
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The probable reasons of the exothermic nature of adsorption is:
| 1. | Adsorption leads to a decrease in the residual forces on the surface of the adsorbent. |
| 2. | ∆S is negative. |
| 3. | Both (1) and (2) |
| 4. | None of the above. |
Subtopic: Adsorption and Absorption |
81%
From NCERT
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Which of the following statement is false?
| 1. | Adsorption is a reversible process and is accompanied by a decrease in pressure. |
| 2. | Adsorption decreases with an increase in pressure. |
| 3. | Adsorption is an exothermic process. |
| 4. | The magnitude of physisorption adsorption decreases with an increase in temperature. |
Subtopic: Adsorption and Absorption |
75%
From NCERT
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Hydrophobic sols are easily coagulated as?
| 1. | The particles present in them come closer and form aggregates, leading to precipitation. |
| 2. | The particles present in them move farther and form aggregates, which leads to precipitation. |
| 3. | The particles present in them come closer and do not form aggregates, leading to precipitation. |
| 4. | The particles present in them move farther and do not form aggregates, leading to precipitation. |
Subtopic: Lyophilic & Lyophobic Sol |
72%
From NCERT
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